package com.util;
import java.security.*;     
import java.security.spec.*;     
    
public class MD5 {     
 public  static String MD5(String s) {     
  char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',     
    'A', 'B', 'C', 'D', 'E', 'F' };     
  try {     
   byte[] strTemp = s.getBytes();     
   MessageDigest mdTemp = MessageDigest.getInstance("MD5");     
   mdTemp.update(strTemp);     
   byte[] md = mdTemp.digest();     
   int j = md.length;     
   char str[] = new char[j * 2];     
   int k = 0;     
   for (int i = 0; i < j; i++) {     
    byte byte0 = md[i];     
    str[k++] = hexDigits[byte0 >>> 4 & 0xf];     
    str[k++] = hexDigits[byte0 & 0xf];     
   }     
   return new String(str);     
  } catch (Exception e) {     
   return null;     
  }     
 }     
    
    
} 